tests/qtest: Skip PXE tests for missing devices

Check if the devices we're trying to add are present in the QEMU
binary. They could have been removed from the build via Kconfig or the
--without-default-devices option.

Signed-off-by: Fabiano Rosas <farosas@suse.de>
Message-Id: <20230208194700.11035-2-farosas@suse.de>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

tests/qtest/pxe-test.c

@@ -108,6 +108,10 @@ static void test_batch(const testdef_t *tests, bool ipv6)
         const testdef_t *test = &tests[i];
         char *testname;
 
+        if (!qtest_has_device(test->model)) {
+            continue;
+        }
+
         testname = g_strdup_printf("pxe/ipv4/%s/%s",
                                    test->machine, test->model);
         qtest_add_data_func(testname, test, test_pxe_ipv4);